JP5812544B2 - Refurbished injector mount - Google Patents

Description

  The present invention relates to injector systems and, more particularly, to retrofit injector mount clamps and related methods for connecting injector system injectors to engine exhaust conduits.

  This section provides background information (not necessarily prior art) to which the present invention relates.

A lean burn engine improves fuel efficiency by operating with excess oxygen in excess of that required to completely burn the fuel. Such an engine is said to run in a “lean” or “lean mixture”. However, this increase in fuel economy is offset by undesirable pollutant emissions (polluted emissions), particularly in the form of nitrogen oxides (NO _x ).

One method used to reduce the NO _X emissions from lean burn internal combustion engine, selective catalytic reduction: known as (selective catalytic reduction SCR). For example, when used to reduce the NO _X emissions from diesel engines, SCR is the exhaust gas temperature, engine speed or engine load as measured by fuel flow of the engine 1 such as a turbo boost pressure or exhaust NO _X mass flow In conjunction with one or more selected engine operating parameters, atomized reagent is injected into the engine exhaust stream. Reagent / exhaust gas mixture, a catalyst which can reduce the NO _X concentration in the presence of a reagent, such as activated carbon or platinum is passed through a reactor that accommodates a metal such as vanadium or tungsten.

  It is known that aqueous urea solutions are effective reagents for SCR systems in diesel engines. Some current injector systems have mounting devices that position the injector a predetermined distance away from the exhaust pipe. Some injector mounting devices are called "dog house" or "stand-off" types. Other current injector systems have a mounting block with a cannula-type protrusion that extends into the exhaust pipe. Such a mounting block has an injector attached to it, which communicates the solution through the mounting block and the cannulated projection into the exhaust pipe. In many instances, such attachment devices are difficult to install quickly and accurately on existing exhaust pipes such as vehicles on site.

  This section provides a general summary of the invention and does not provide an easy-to-understand disclosure of the full scope or features of the invention.

  The injector mount clamp that connects the injector of the exhaust gas treatment system to the exhaust pipe of the engine while maintaining the exhaust pipe in the mounted position has an elastic integral clamp body that has a hole extending therethrough. And is formed as a split collar having a first end and a second end, and the first end can move the clamp body laterally with respect to the exhaust flow direction to a position surrounding the exhaust pipe in the circumferential direction. Is spaced from the second end by a distance of An injector mounting boss is disposed on the clamp body and a passage is formed in fluid communication with the hole in the clamp body. The mounting boss includes a mounting surface configured to face the injector.

  According to another feature, each of the first end and the second end has a mounting ear extending therefrom. Both attachment ears have complementary engagement surfaces configured to engage each other in the mounting position. A thread is formed in the passage of the cylindrical body portion and is configured to be threadedly engaged with the complementary thread of the injector.

  According to yet another feature, the injector mount clamp further includes a thermal insulator configured to be disposed between the clamp body and the exhaust pipe at the mounting position. The injector mounting boss is formed of stainless steel and is welded to the clamp body. The clamp body is configured to bend radially outward during the mounting process to accommodate the exhaust pipe and then bend radially inward to a position where the clamp body is secured to the exhaust pipe. .

  A method for converting an injector of an exhaust gas treatment system into an exhaust pipe of an engine includes a step of forming an opening in the exhaust pipe. The clamp body of the injector mount clamp is moved laterally around the exhaust pipe with respect to the exhaust flow through the exhaust pipe. The clamp body has a first end and a second end and an injector mounting boss disposed on the clamp body. The injector mounting boss is formed with a passage in fluid communication with the opening of the exhaust pipe. The fastener is inserted through a hole in a complementary ear extending from the first end and the second end of the clamp body. The fastener is clamped against the clamp body and brings the first and second ends of the clamp body closer together to prevent the clamp body from sliding along the exhaust pipe. The insertion end of the injector is moved into the injector mounting boss until the injector engages the exhaust pipe.

  According to another feature, moving the clamp body comprises expanding the clamp body radially until both ears exceed the outer diameter of the exhaust pipe. By tightening the fastener, the clamp body is radially reduced to a profile that matches the exhaust pipe. A heat insulating material is disposed between the clamp body and the exhaust pipe. The step of moving to the insertion end of the injector consists of advancing the insertion end of the injector along a complementary screw formed on the mounting boss. The injector insertion end is advanced so that the end of the injector engages the exhaust pipe without protruding beyond the inner diameter of the exhaust pipe.

  Other areas of applicability will become apparent from the description given below. The descriptions and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the invention.

  The accompanying drawings are only for the purpose of illustrating selected embodiments, and not all possible embodiments, and are not intended to limit the scope of the invention.

1 is a schematic diagram illustrating an example internal combustion engine with an emission control system using an injector mount clamp according to the present invention. It is a perspective view which shows the place which has the injector mount clamp and injector which were fixed to the exhaust pipe in an attachment position. It is a disassembled perspective view which shows the injector mount clamp of FIG. 2, an injector, and an exhaust pipe. FIG. 4 is a cross-sectional view showing an injector mount clamp, an injector, and an exhaust pipe along line 4-4 in FIG. It is drawing which illustrates the mounting | wearing sequence which retrofits the existing exhaust pipe provided with the injector. FIG. 6 is a drawing showing an example of a mounting sequence in which an injector mount clamp is first expanded to fit the outer diameter of the exhaust pipe and then radially reduced by a fastener to match the exhaust pipe. FIG. 6 is a perspective view showing an injector mount clamp configured in accordance with additional features of the present invention and an injector mount coupled to the clamp.

  Throughout the accompanying drawings, the same parts are denoted by the same reference numerals.

  Exemplary embodiments will now be described more fully with reference to the accompanying drawings.

  Referring initially to FIGS. 1 and 2, an injector mount clamp constructed in accordance with the present invention is indicated generally by the reference numeral 10. The injector mount clamp 10 is connected so as to act on the exhaust pipe 12 of the engine 14. The injector mount clamp 10 of the present invention is configured to connect the reagent injector 18 of the exhaust gas treatment assembly 20 to the exhaust pipe 12. As will become apparent from the following description, the injector mount clamp 10 is particularly suitable for retrofitting to an existing exhaust pipe 12. Prior to describing the injector mount clamp 10, an exemplary contamination control system 22 incorporating an exhaust gas treatment assembly 20 will first be described.

Pollution control system 22 is configured to reduce NO _X emissions from the exhaust pipe 12 of the engine 14. In the illustrated configuration, engine 14 is a diesel engine. In FIG. 1, a solid line connecting elements of the contamination control system 22 indicates a reagent fluid line, and a broken line indicates an electrical connection. The contamination control system 22 of the present invention includes a reagent tank 26 that holds a reagent, and a delivery module 28 that distributes the reagent from the tank 26. Reagents can be composed of urea solutions, hydrocarbons, alkyl-esters, alcohols, organic compounds, water, etc., and can also be composed of blends or combinations thereof. One or more reagents can be used in the system, and can be used alone or in combination. Tank 26 and delivery module 28 may be formed as an integrated reagent tank / delivery module. As part of the contamination control system 22, a reagent electronic injection controller 30, a reagent injector 18, and an exhaust system 32 are provided. The exhaust system 32 has an exhaust pipe 12 that supplies an exhaust stream to at least one catalyst bed 36.

  The delivery module 28 can be a pump that supplies reagents from the tank 26 via a supply line 38. The reagent tank 26 can be formed of polypropylene, epoxy-coated carbon steel, PVC or stainless steel and is sized according to the application (eg, vehicle size, intended use of the vehicle, etc.). A pressure regulator (not shown) is provided to maintain the system 22 at a predetermined pressure set point (e.g., a relatively low pressure of 60-80 psi, or in some embodiments, a pressure of about 60-150 psi). A regulator can be placed in the return line 40 from the injector 18. Further, a pressure sensor can be provided in the supply line 38 led to the reagent injector 18. The contamination control system 22 incorporates various freeze protection means for thawing the frozen reagent or preventing the reagent from freezing. During operation of the system, regardless of whether the reagent injector 18 is releasing the reagent into the exhaust gas, the reagent is continuously circulated between the tank 26 and the injector 18 to cool the reagent injector 18 and the injector. The reagent residence time in 18 is minimized and the reagent is kept cold. In the case of temperature sensitive reagents such as aqueous urea that readily solidify when exposed to high temperatures of 300 ° C. to 650 ° C. received in the engine exhaust system, continuous reagent circulation is required. Also, in certain instances, it is desirable to maintain the reagent mixture within a low operating range of 140 ° C. or lower, preferably 5 ° C. to 95 ° C., to ensure that the reagent is not coagulated. If the reagent may solidify, the moving parts and the opening of the injector 18 may be clogged.

Required amount of reagents, change the load, engine speed, exhaust rate, exhaust gas temperature, exhaust gas flow, engine fuel, injection timing, a desired amount of reduction in NO _X, atmospheric pressure, relative humidity, the EGR flow rate and engine coolant temperature To do. A NO _X sensor, that is, a NO _X meter 46 is arranged on the downstream side of the catalyst bed 36. The NO _X sensor 46 operates to output an exhaust NO _X content display signal to the controller 30. All or some of the engine operating parameters are supplied from the engine control unit 48 to the reagent electronic injection controller 30 via the engine / vehicle data bus. The reagent electronic injection controller 30 can also be configured as a part of the engine control unit 48. Exhaust gas temperature, exhaust gas flow rate and exhaust back pressure and other vehicle operating parameters are measured by respective sensors (not specifically shown).

  With particular reference now to FIGS. 1-4, the exhaust pipe 12 includes a substantially cylindrical tube 50 that forms an exhaust passage 52. The cylindrical tube 50 further has an inner surface 54 and an outer surface 55.

  Now, with particular reference to FIG. 4, further features of the injector 18 will be described in detail. The injector 18 has an injector body 56. The injector body 56 is formed with a cylindrical chamber 60 that receives a valve member 62 that linearly moves in the axial direction. The injector body 56 has an outlet orifice 66 at a discharge position of the injected reagent. A valve seat 70 is formed near the outlet orifice 66. The valve seat 70 selectively engages with the valve member 62 to control the injection of the reagent into the exhaust gas passage. The valve member 62 can linearly move along the reagent injection axis.

  An adapter 80 is fixed to the injector body 56, and the adapter 80 has a flange 82 extending radially outward and a cylindrical male extension 86. The male extension 86 forms an outer diameter 87 with a male screw 88 and extends to the terminal end 90. Injector flange 82 defines an outer diameter 91 and has an injector flange surface 92 (FIG. 3). The outer diameter 91 of the injector flange 82 is larger than the outer diameter 87 of the male extension 86.

  The injector mount clamp 10 will now be described in more detail with reference to FIGS. The injector mount clamp 10 generally has a clamp body 100 and an injector mounting boss 102. The clamp body 100 generally has a thin-walled cylindrical band of material that extends from the first end 104 to the second end 106. The injector mount clamp 10 is formed of a metal material such as stainless steel, but is not limited thereto. First and second attachment ears 108 and 110 are formed at the ends 104 and 106, respectively. Supplementary passages 112 and 114 are collectively formed in the mounting ears 108 and 110. Passages 112 and 114 are configured to align with and receive fasteners 116 and 118, respectively. The fasteners 116, 118 receive the nuts 120, 122 and are screwed in the assembled position (FIG. 2). Other forms are also conceivable. For example, one or three or more fasteners can be assembled. In addition or alternatively, other fixing members such as clips, rivets, screw clamps, etc. can be used.

  The injector mounting boss 102 generally has a cylindrical body portion 130 and a flange 132 extending therefrom. The injector mounting boss flange 132 has an outer mounting surface 134 (FIG. 3). In one example, the injector mounting boss 102 is welded to the clamp body 100. Since the injector mounting boss 102 is pre-welded to the clamp body 100, the refurbishr need not connect the injector mounting boss 102 to the clamp body 100.

  The injector mounting boss 102 forms a female receiving portion or female passage 136 that is configured to receive the cylindrical male extension 86 of the injector 18. In this regard, the female receiving portion 136 has a female screw 140 that complements the male screw 88 of the injector 18. According to one form, the cylindrical body portion 130 has an outer diameter 150. The injector mounting boss flange 132 has an outer diameter 152. The outer diameter 152 of the injector mounting boss flange 132 is larger than the outer diameter of the cylindrical body portion 130. The cylindrical body portion 130 has an inner diameter 154 that is sized to receive the cylindrical male extension 86 in the assembled position (FIG. 4). Further, the outer mounting surface 134 of the injector mounting boss flange 132 is configured to face the injector flange surface 92 of the injector flange 82 at the assembly position. A gasket 156 is disposed between the injector flange 82 and the injector mounting boss flange 132. The gasket 156 can be formed of an elastic material. According to one example, the terminal end 90 of the cylindrical male extension 86 of the injector 18 can engage the outer surface 55 of the cylindrical tube 50. The injector mount clamp 10 is also positioned at a position on the cylindrical tube 50 such that the passage 136 of the cylindrical body portion 130 is substantially aligned with the opening 160 formed through the cylindrical tube 50. .

  In one example, the opening 160 has an inner diameter 162 that is smaller than the outer diameter 87 of the cylindrical male extension 86. Since the opening 160 is smaller than the outer diameter 87 of the cylindrical male extension 86, the end portion 90 can be configured to engage the outer surface 55. Such an engagement is the same as the engagement of the outer mounting surface 134, the gasket 156, and the injector flange surface 92. In another configuration, the outer diameter 87 of the male extension 86 is smaller than the inner diameter 162 of the opening 160 so that the terminal end 90 extends to a position between the inner surface 54 and the outer surface 55 of the cylindrical tube 50. It will be understood that it can be configured. However, it will be appreciated that the terminal end 90 does not extend beyond the inner surface 54 in the mounting position.

  With particular reference now to FIG. 5, an exemplary sequence according to the present invention for retrofitting an injector mount clamp 10 to an existing exhaust pipe 12 will be described. Initially, it will be appreciated that the injector mount clamp 10 is particularly suitable for retrofitting the injector 18 associated with the exhaust gas treatment assembly 20. In this regard, the refurbishr observes the existing exhaust pipe 12 and identifies a preferred location along the exhaust pipe 12.

  According to one example, the injector mount clamp 10 is positioned at a desired location in the exhaust pipe 12 while the cutting tool 200 is guided through the passage 136 to form an opening 160 through the cylindrical tube 50 of the exhaust pipe 12. The It will be appreciated that other methods can be implemented. For example, the remodeler uses a marking device (not shown) or the like to mark the desired position of the injector mount clamp 10 and moves the injector mount clamp 10 away from the verification position. Next, an opening 160 passing through the cylindrical tube 50 of the exhaust pipe 12 is formed using the cutting tool 200. Although the cutting tool 200 is shown as a drill blade, other tools such as a punch may be used.

  Due to the opening 160 formed through the cylindrical tube 50 of the exhaust pipe 12, the injector mount clamp 10 is cylindrically positioned at a position where the female receiving portion 136 of the injector mounting boss 102 is aligned with the opening 160 to allow fluid to pass. Connected to the tube 50. FIG. 6 shows one particular example of connecting the injector mount clamp 10 to the cylindrical tube 50 of the exhaust pipe 12, which will be described in detail below. Once the injector mount clamp 10 is secured to the cylindrical tube 50 of the exhaust pipe 12, the injector 18 can be coupled to the injector mounting boss 102. More particularly, the male extension 86 is advanced into the receiving portion 136 of the cylindrical body portion 130 of the injector mounting boss 102. In the particular example shown, the male thread 88 of the injector 18 is advanced along the female thread 140 of the cylindrical body portion 130 of the injector mounting boss 102. In one example, the male extension 86 is advanced until it engages the cylindrical tube 50 of the exhaust pipe 12. At this point, the gasket 156 is engaged and / or compressed between the injector flange surface 92 and the outer mounting surface 134 of the injector mounting boss 102.

  With reference to FIG. 6, an exemplary sequence for attaching the injector mount clamp 10 to the cylindrical tube 50 of the exhaust pipe 12 will be described. First, the clamp body 100 is radially expanded by opening both ears 108 and 110 together until the clamp body 100 of the injector mount clamp 10 is sufficiently open in the radial direction to surround the cylindrical tube 50. Next, the clamp body 100 is moved laterally with respect to the exhaust flow so as to surround the exhaust pipe 12. Next, the clamp body 100 is radially contracted around the cylindrical tube 50 of the exhaust pipe 12, and the fasteners 116 and 118 are inserted into the respective passages 112 and 114. Next, the nuts 120 and 122 are fastened to the fasteners 116 and 118, and the injector mount clamp 10 is fixed to the cylindrical tube 50. In the mounted state, the heat insulating material 202 is disposed between the clamp body 100 of the injector mount clamp 10 and the cylindrical tube 50 of the exhaust pipe 12. The heat insulating material 202 can thermally insulate the clamp body 100 from the cylindrical tube 50 of the exhaust pipe 12. Although both ears 108 and 110 are shown in contact with each other at the wearing position, they may be spaced apart from each other. Also, multiple injector mount clamps can be prepared so that exhaust pipes of various diameters can be retrofitted. For example, the injector mount clamp can be sized to be attached to 2, 2.5, 3, 3.5, 4, 5 and 6 inch exhaust pipes, and other sizes are contemplated.

  FIG. 7 shows an injector mount clamp 300 constructed in accordance with another aspect of the present invention. The injector mount clamp 300 has a cylindrical clamp body 302 and an injector mounting boss 304 as a whole. Unless otherwise described herein, the injector mount clamp 300 is configured in the same manner as the injector mount clamp 10. However, the cylindrical clamp body 302 has mounting ears 312, 314 located at different positions compared to the embodiment shown in FIG. In this regard, the mounting ears 312 and 314 are disposed on the cylindrical clamp body 302 at a position closer to the injector mounting boss 304 as compared to the embodiment shown in FIG. In applications where access to the fasteners 116, 118 and the injector mounting boss 304 is more convenient, the mounting ears 312, 314 are preferably located at a different location than the injector mount clamp 10.

While the present invention has been described renovated exhaust pipe associated with the reduction of the diesel engine and NO _X emissions, renovated injector mounting clamp 10 of the present invention, a diesel, gasoline, turbine, fuel cell, a jet or exhaust flow It can be used in combination with any of a number of exhaust streams from any other power source that discharges. The present invention can also be used in connection with reducing any of the many undesirable emissions, for example, the injection of hydrocarbons for regeneration of diesel particulate filters is within the scope of the present invention.

  The above description of embodiments of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure. The individual elements or features of a particular embodiment are not limited to a particular embodiment, but are interchangeable and can be used in selected embodiments unless otherwise shown or described. Can be changed. Such modifications are not to be regarded as a departure from the invention, and all such embodiments are intended to be included within the scope of the invention.

10, 300 Injector mount clamp 12 Exhaust pipe 18 Injector 80 Adapter 86 Male extension part 100, 302 Clamp body 108, 110, 312, 314 Mounting ear 132, 304 Injector mounting boss 136 Female receiving part 202 Insulating material

Claims (18)

In the injector mount clamp that connects the exhaust gas processing system injector to the engine exhaust pipe while maintaining the exhaust pipe in the mounted position,
An elastic monolithic clamp body, the clamp body having a hole extending therethrough and shaped as a split collar with a first end and a second end, the first end having an exhaust pipe; The clamp body is spaced from the second end by a distance that allows the clamp body to move laterally with respect to the exhaust flow direction to a position surrounding the circumferential direction,
An injector mounting boss disposed on the clamp body and formed with a passage in fluid communication with the hole in the clamp body, the mounting boss comprising a mounting surface configured to face the injector ;
Injector mounting clamp, wherein Rukoto that Yusuke further insulation coupled to the inner surface of the clamp body.   Each of the first end and the second end has attachment ears extending therefrom, at least one complementary passage therethrough is formed in both attachment ears, and the clamp approaches the attachment ears to each other The injector mount clamp according to claim 1, further comprising a fastener for reducing the inner diameter of the split collar.   3. The injector mount clamp of claim 2, wherein the mounting ears have complementary engagement surfaces configured to engage the exhaust pipe during lateral movement.   The injector mount clamp of claim 1, wherein the boss passage is threaded and configured to threadably engage a complementary thread of the injector.   The injector mount clamp according to claim 1, wherein the injector mounting boss is welded to a clamp body. 6. The injector mount clamp according to claim 5, wherein the clamp body is made of stainless steel.   The distance between the first end and the second end is smaller than the outer diameter of the exhaust pipe, so that the clamp body deflects radially outward during the mounting process to accommodate the exhaust pipe, and then the clamp 3. The injector mount clamp according to claim 2, wherein the body is bent radially inward to a position where the body is fixed to the exhaust pipe. An injector mount clamp for connecting an injector of an exhaust gas processing system to an exhaust pipe of an engine while maintaining the exhaust pipe in a mounting position, wherein the exhaust pipe has an opening.
A clamp body having a first end and a second end, the clamp body having a generally circumferential profile configured to match the exhaust pipe, the clamp body having a hole Having a thickness to form
An injector mounting boss disposed on the clamp body, the injector mounting boss comprising a cylindrical body portion and a flange, the cylindrical body portion forming a passage in fluid communication with a hole in the clamp body, the flange being Provided with an outer mounting surface, the outer mounting surface being configured to face the complementary flange of the injector so that when in the mounted position, the end of the injector projects beyond the inner peripheral surface of the exhaust pipe no to the exhaust pipe in fluid communication with,
The cylindrical body portion has a first inner diameter, the exhaust pipe opening has a second inner diameter, the second inner diameter is smaller than the first inner diameter, and the axial cores of both the inner diameters are positioned coaxially, and the injector the injector mount clamp terminal end characterized that you have been fitted into the first inner diameter. An injector mount clamp for connecting an injector of an exhaust gas processing system to an exhaust pipe of an engine while maintaining the exhaust pipe in a mounting position, wherein the exhaust pipe has an opening.
A clamp body having a first end and a second end, the clamp body having a generally circumferential profile configured to match the exhaust pipe, the clamp body having a hole Having a thickness to form
An injector mounting boss disposed on the clamp body, the injector mounting boss comprising a cylindrical body portion and a flange, the cylindrical body portion forming a passage in fluid communication with a hole in the clamp body, the flange being Provided with an outer mounting surface, the outer mounting surface being configured to face the complementary flange of the injector so that when in the mounted position, the end of the injector projects beyond the inner peripheral surface of the exhaust pipe no to the exhaust pipe in fluid communication with,
When the clamp is in the mounting position, the injector mounting clamp, characterized by further have a structure thermal insulation material so as to be disposed between the clamp body and the exhaust pipe. Each of the first end and the second end has attachment ears extending therefrom, the attachment ears having complementary engagement surfaces configured to engage in a mounting position. The injector mount clamp according to claim 8 or 9, characterized in that 11. An injector mount clamp according to claim 10 , wherein at least one complementary passage is formed in each of the mounting ears, and the complementary passage is configured to receive a fastener at the mounting position. 12. The injector mount clamp of claim 11, wherein the cylindrical body portion passage is threaded and configured to threadably engage a complementary thread of the injector. The thickness of the clamp body is such that the clamp body can bend radially outward during the mounting process to accommodate the exhaust pipe and then be bent radially inward to a position where it is secured to the exhaust pipe. The injector mount clamp according to claim 10 , wherein the injector mount clamp is configured as follows. In a method of retrofitting an exhaust gas treatment system injector to an engine exhaust pipe,
Forming an opening in the exhaust pipe; and
Advancing the clamp body of the injector mount clamp around the exhaust pipe in a direction transverse to the flow of exhaust through the exhaust pipe, the clamp body having a first end and a second end as well as the clamp body An injector mounting boss disposed, the injector mounting boss having a passage in fluid communication with the opening of the exhaust pipe;
Advancing the fastener through a hole formed in a complementary ear extending from the first end and the second end of the clamp body;
Tightening the fastener against the clamp body and bringing the first and second ends of the clamp body closer together to prevent the clamp body from sliding along the exhaust pipe;
Advancing the insertion end of the injector into the injector mounting boss until the injector engages the exhaust pipe ,
The method further comprises disposing a heat insulating material between the clamp body and the exhaust pipe . In a method of retrofitting an exhaust gas treatment system injector to an engine exhaust pipe,
Forming an opening in the exhaust pipe; and
Advancing the clamp body of the injector mount clamp around the exhaust pipe in a direction transverse to the flow of exhaust through the exhaust pipe, the clamp body having a first end and a second end as well as the clamp body An injector mounting boss disposed, the injector mounting boss having a passage in fluid communication with the opening of the exhaust pipe;
Advancing the fastener through a hole formed in a complementary ear extending from the first end and the second end of the clamp body;
Tightening the fastener against the clamp body and bringing the first and second ends of the clamp body closer together to prevent the clamp body from sliding along the exhaust pipe;
Until the injector engages the exhaust pipe, further possess a step of advancing the insertion end of the injector to the injector mounting boss,
Forming an opening in the exhaust pipe, wherein the cutting tool, the Rukoto such since the guide through the passageway formed by the mounting boss. The step of advancing the clamp body consists of radially expanding the clamp body until both ears exceed the outer diameter of the exhaust pipe. By tightening the fastener, the clamp body reaches a profile that matches the exhaust pipe. 16. A method according to claim 14 or 15 , characterized in that it is reduced in the radial direction. Step of advancing the insertion end of the injector, the insertion end of the injector, along complementary threads formed on the mounting boss of claim 14 or 15 further characterized in that consists in advancing the threaded engagement Method. 18. The method of claim 17 , further comprising stopping advancement so that the end of the injector engages the exhaust pipe without protruding beyond the inner diameter of the exhaust pipe.

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